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http://dx.doi.org/10.5369/JSST.2015.24.4.228

Ring-Type Rotary Ultrasonic Motor Using Lead-free Ceramics  

Hong, Chang-Hyo (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology)
Han, Hyoung-Su (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology)
Lee, Jae-Shin (School of Materials Science and Engineering, University of Ulsan)
Wang, Ke (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University)
Yao, Fang-Zhou (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University)
Li, Jing-Feng (State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University)
Gwon, Jung-Ho (HanaUtech)
Quyet, Nguyen Van (HanaUtech)
Jung, Jin-Kyung (School of Materials Science and Engineering, University of Ulsan)
Jo, Wook (School of Materials Science and Engineering, Ulsan National Institute of Science and Technology)
Publication Information
Journal of Sensor Science and Technology / v.24, no.4, 2015 , pp. 228-231 More about this Journal
Abstract
Ultrasonic motors provide high torques and quick responses compared to their magnetic counterparts; therefore, they are widely used in small-scale applications such as mobile phones, microrobots, and auto-focusing modules in digital cameras. To determine the feasibility of lead-free piezoceramics for ultrasonic motor applications, we fabricated a ring-type piezoceramic with a KNN-based lead-free piezoceramic (referred to as CZ5), intended for use in an auto-focusing module of a digital camera. The vibration of the lead-free stator was observed at 45.1 kHz. It is noteworthy that the fully assembled lead-free ultrasonic motor exhibited a revolution speed of 5-7 rpm, even though impedance matching with neighboring components was not considered. This result suggests that the tested KNN-based piezoceramic has great potential for use in ultrasonic motor applications, requiring minimal modifications to existing lead-based systems.
Keywords
Ultrasonic motors; Lead-free; $(K_{0.5}Na_{0.5})NbO_3$; Piezoelectrics; Auto-focusing module;
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